New Zealand captain Richie McCaw is not concerned by the presence of former All Blacks coach Sir Graham Henry in the Argentina set-up ahead of their Rugby Championship clash in Wellington on Saturday.

Henry, who steered the All Blacks to Rugby World Cup glory last year, linked up with the Pumas earlier this year in a consultancy role and will help coach against his former charges for the first time at the Westpac Stadium.

But McCaw is not losing any sleep about it as his side look to make it three wins from three in this year's battle for southern hemisphere supremacy having notched back-to-back wins against Australia. "To be honest it doesn't really worry me," said McCaw. "We've got to focus on what we need to worry about, and what we did last year is last year. To be honest I haven't really given it much thought."

McCaw has also played down the advantage that Henry may provide Argentina as they look for their first-ever win against the All Blacks. "You watch last week's game and you pick up probably what you want to anyway," he added. "You have an idea what the opposition is going to do but the key is to stop it. That's what we've got to do.

"You don't change things a whole lot week to week, but it's the subtle changes that are different, and we change them all the time. It comes down to getting the set piece right and getting ball across the advantage line. I've been in teams where we know what other teams are doing but you can't stop it. That's what we've got to make sure we do."

McCaw even went as far to welcome Henry' s input into Argentinian rugby as he thinks it will benefit the competition in the long run. "You want four teams that are going to be hugely competitive. The Argentineans have already showed that, and they probably should have won [in Mendoza] against South Africa. So it makes for a pretty good competition, and just means you've got to be on the job every week."